Flue-cutter.



No. 646,747.. Patented Apr. 3, |900.

.L MAcKENzIE. ELuE cuTTEn.

- (Appumion mea Aug; 2a, m99.) (No Model.) 2 shouts-Sheet I.

Patented Apr. 3, |900. v

No. 646,747. Y .1. MAcKENzlE.

A FLUE CUTTER.

(Application Bled Aug. 28, 1899.) l (No Model.) 2 Sheets-Sheet 2.

0 a G Z E Q -IT- lf :i

E OE 0 0 UNITED STATESv PATENT OFFICE.

JOHN MACKENZIE, OF CLEVELAND, OHIO.

FLUE-CUTTER.

SPECIFIATIoNfOrming part of Letters raten-t No. 646,747, dated April' e, 190e.

Application led August 23 1899.

T0 all 'whom t may concern.`A

Be it known that I, JOHN MAGKENZIE, a citizen of the United States of America, residing at Cleveland, inthe county of Cuyahoga, in the State of Ohio, have invented certain new and useful Improvements inFlue-Cutters, of which the following is a description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates more particularly to that class of rotary flue-cutters which are adapted to be inserted in the end of the boilerflue and operated to cut oif the tip of the line inside the boiler; but it is also applicable to other work, and the cutting instrument may be replaced by a roller and the tool thereby adapted for rolling or expanding ues.

It has for its object the provision of a simple and efficient device of this character which shall be operated entirely by motive iiuid both for rotating the tool and for forcing the cutter radially outward to sever the flue, all as hereinafter set forth, and particularly pointed out in the claims. Y

In the accompanying drawings, Figure l is a perspective view of the complete device or machine composed of the flue-cutter proper and the motor or engine for operating it; Fig. 2, a top plan View of the fine-cutter disconnected from the motor; Fig. 3, a middle longitudinal section of Fig. 2, and Fig. 4 a crosssectional detail on the line 4 4 of Fig. 3.

A The same letters of reference are used to designate corresponding parts in the several views.

The engine or motor A (illustrated in Fig. 1 of the accompanying drawings) may be of any suitable construction, the only requirement for the purposes of my present invention being that it shall be of suitable size and capable of driving a rotary spindle or tool-stock in one direction and of then being reversed and driving it in the opposite direction. The motor which I have extensively used as part of my complete flue-cutting tool and have therefore shown in the accompanying drawings is one of familiar type now upon the market and in practical use for a variety of purposes. It i's not deemed necessary to illustrate the entire construction of this motor nor 'to describe it further than to say that the casing contains a pair of oscillating engines driving a crankserial No. 728,150. (No model.)

shaft which is geared at its front end (through atrain of speed-reducing gears inclosed within the supplemental casing B) with a spindle carrying the usual chuck for receiving the end of the tool-stock of any suitable tool to be driven by the motor, and that it is provided with two handles C C', through which latter the motive fluid is admitted to the cylinders within the casing from a suitable flexible supply-pipe and upon which is mounted a rotatable sleeve D, by turning which in one direction or the other the motor may be reversed, as desired, to drive the tool operated by it in one direction or the other, all as fully explained in the aforesaid pending application. In the presence instance the motor is also shown provided at its rear end with a projecting stem E, carrying a breastplate or pressure-piece F.

G represents the tool-stock of my rotary flue-cutting tool propergand its rear end is suitably shaped, as in Figs. 2 and 3, to it within the chuck or holder upon the spindle of the motor to cause the latter to drive the tool. The middle portion of the tool-stock G is exteriorly threaded, and mounted upon this threaded portion of the tool-stock is a nut H, provided upon its opposite sides with outwardly-projecting arms or wings II, whose extremities are confined in and adapted to play longitudinally of slots in plates J J, secured to and projecting forwardly from the For convenience of constructhe present instance of two halves secured together by bolts a, but in operation it is a solid nut and may be so made. It will be understood from the foregoing description that lwhen the tool-stock G is driven in one direction by the motor the nut H will be advanced along the tool-stock and that when the toolstock is driven in the opposite direction the nut will be moved rearward toward the motor. The middle threaded portion of the tool-stock is also provided with a longitudinal slot or opening K, which communicates at its forward end with an approximately-central bore L, extending on forwardly entirely through the front end of the tool-stock. Extending transversely through the slot K in the toolstock and adapted to move longitudinally thereof is a cross-head M, whose opposite ends are confined in an internal circumferential groove N in the nut II. Connected to this cross-head M is the rear end of a tapered mandrel O, which extends forward through the slot K and bore L and projects between a pair of antifriction-rollers P, suitably mounted in the tool-stock G, and the under side of a radially-movable block Q, mounted in a recess formed to receive it in the toolstock G and having journaled in it the rotary cutting-disk R. When the tapered mandrel O is advanced, it forces the block Q and cutting-disk R outward and causes the disk to engage the surface'of the iiue, into which the front end of the instrument has been inserted.

For the purpose of limiting the depth of insertion of the tool into the end of the iiue the tool-stock may be provided in rear of the cutting-disk with an integral annular shoulder or fiange to abut against the end of the fiue or surface of the tube-sheet, as usual; but in the present instance to eliminate the friction which would occur between such shoulder and the end of the tube as the tool is rotated I provide a bearing-ring S, turning upon ball-bearings. A collar T is screwed upon the tool-stock G and locked in place thereon by a nut U. A ball-race is formed between the adjacent faces of this collar and the ring S, in which is arranged a circle of antifriction-balls d. A cap V, secured to the collar T by screws e, surrounds said collar and the. ring S and is provided at its front end with an inwardly-projecting flange engaging an annular shoulder formed upon the ring S, which permits the ring to project through the cap, so as to contact with the end of the Hue, but prevent its escape from the cap. The ring S thus confined receives the end thrust of the tool and turns freely upon the balls d, thereby reducing to a minimum the friction between the tool and the end of the ue.

A pin l), projecting rearwardly from a plate c, secured to the front end of the tool-stock G, fits at its rear end in a groove formed in the front side of the block Q and serves to limit the outward movement of the latter and prevent its escape from the tool.

Under the above-described construction and arrangement of parts the operation is as follows, assuming the nut H to be in the position shown in Fig. 1 or slightly rearward of such position: The front end of the tool-stock G is inserted into the end of the liuc which is to be operated upon until the ring S upon the tool-stock contacts with the end of the flue or the tube-sheet in which the end of the line is secured. With the reversing-gear of the motor set by means of the sleeve I) to drive the tool-stock G in the direction of the arrow the motive fiuid is then turned onto the motor, and the tool-stock thereby driven in such direction. The turning of the threaded portion of the tool-stock within the nut II will cause the latter to be moved forward, inasmuch as the nut itself is held from turning by the engagement of its arms I with the slotted plates J, and this forward movement of the nut I-I will advance the tapered mandrel O and canse it to force outward the block Q and cu tting-disk R and bring the latter into contact with the inner surface of the liue, where it will cut a circumferential groove and be gradually forced farther and farther outward by the advance of the nut II as the tool-stock G continues to rotate until the flue is entirely severed. The motor is then reversed by turning the sleeveD to its opposite position, and the tool-stock rotated in the opposite direction until the nutHhas been returned to its rearward position and the mandrel O retracted and the cutting-disk R disengaged from the severed fiue-tip, whereupon the tool is withdrawn from the flue and inserted in the next one and the operation repeated.

As will be understood from the foregoing description, my novel flue-cutting tool is operated entirely by motive fluid and with it a single operator can sever the tips of a set of boiler-lines with great case and rapidity, being required simply to insert the end of the tool in a flue, admit the motive fiuid to the motor, and hold the tool in position until the fine has been severed, then reverse the motor, and thereby cause it to retract the nut and mandrel and disengage the cutter from the ue, and then withdraw the tool from the flue and insert it in the next one, all of which may be accomplished and the operation repeated indefinitely without the operator removing his hands from the handles of the motor, since the throttle-Valve for controlling the admission of the motive iuid to the motor is operated by a sleeve C upon the handle C, adjacent the reversingsleeve D, as described in the aforesaid pending application, so that the operator simply slips his right hand back and forth from one sleeve to the other, as occasion requires.

Having thus fully described my invention, I claim- 1. A power-driven flue-cutter comprisinga rotary tool-stock, an outwardly-movable cutter, and means operated by motive fiuid both to rotate the tool-stock and to force the cutter outward Without longitudinal movement of the tool-stock as the latter rotates, substantially as described.

2. A power-driven Hue-cutter comprising a rotary tool-stoclz,an outwardly-m ovable rotary cutting-disk suitably mounted in the front end of said tool-stock, and means operated by motive fiuid for both rotating the tool-stock and forcing the cutting-disk outward without longitudinal movement of the tool-stock as the latter rotates, substantially as described.

3. A portable power driven flue cutter adapt-ed to be manually supported and handled by the workman, and comprising a rotary tool-stock adapted to abut and rotate against the end of the flue or surface of the tube-sheet, an outwardly-movable cutter carried by said tool-stock, and means operated IOO IIO

by motive iuid for both rotating the toolstock and forcing the cutting-disk outward as the tool-stock rotates in abutment with the end of the ilue and without longitudinal movement in relation thereto, substantially as described.

t. The combination of a motor,a rotary toolstock driven thereby, a nut threaded upon said tool-stock and held from turning by a connection with the motor,an outwardly-movable cutter carried by the tool-stock, and means intermediate said nut and cutter for forcing the latter outward as the tool-stock is rotated, substantially as described.

5. The combination of a reversible motor,

a rotary tool-stock driven thereby,- a nut threaded upon said tool-stock and held in fixed position relatively to the motor, a radiallymovable cutter mounted in the tool-stock, and means intermediate said nut and cutter for causing the cutter to be forced outward when the nut is advanced by the rotation of the tool-stock in one direction, and permitted to move inward when the nut is retracted by the rotation of the tool-stock in the opposite direction, substantially as described.

6. The combination of a reversible motor, a rotary tool-stock driven thereby, a nut threaded upon said tool-stock and held in fixed position relatively to the motor, a radiallymovable cutter mounted in the tool-stock, and a tapered mandrel movable longitudinally of the tool-stock and operated by the nut and cooperating. with the radially-movable cutter to force the latter outward as the mandrel is advanced by the nut during the rotation of the tool-stock in one direction and permitting it to be retracted as the mandrel is withdrawn' by the n ut during the reverse rotation of the tool-stock, substantially as described.

7. The combination of the motor A, the rotary tool-stock G driven thereby, the nut H threaded upon the tool-stock G and held from turning by a connection with the motor-casing, the radially-movable cutter R, and a connection between the nut H andV cutter R for forcing the latter outward as the nut is advanced by the turning of the tool-stock, substantially as described.

8. The combination'of the motor A, the r0- tary tool-stock G driven thereby, the nut H threaded upon the tool-stock and provided with the outwardly-projecting arms or wings I I having a sliding connection with the plates J J projecting from the motor-casing, the radially-movable cutter R, and a connection between the nut H and cutter R for forcing the latter outward as the nut is advanced by the turning of the tool-stock, substantially as described.

9. The combination of the motor A, the rotary tool-stock G driven thereby, the nut H threaded upon the tool-stock and held from turning bya sliding connection with the motor-casing, the radially movable block Q mounted upon the front end of the tool-stock and carrying the rotary cutting-disk R, and the tapered mandrel O operated by the nut H and cooperating with the block Q, substantially as described.

l0. The combination of the motor A, the' rotary tool-stock G driven thereby, the nut H threaded upon said tool-stock and held from turning lby a sliding` connection with the motor-casin g, the radially movable block Q` mounted in the front end of the tool-stock and carrying the rotary cutting-disk R, the antifriction-rollers P mounted in the tool-stock opposite the block Q, the tapered mandrel O interposed between said rollers and block, and the cross-head M connected to the rear end of the mandrel O andengaging the nut H, substantially yas described.

ll. In a rotary due-cutter, the combination of the tool-stock G and the antifricticn-bearing ring S surrounding the tool-stock and turning independently thereof upon the balls d and adapted to receive the end thrust of the tool, substantially as described.

12. In a rotary flue-cutter, the combination of the tool-stock G, the collar T secured thereon, the ring S surrounding and free to turn upon the tool-stock, the balls d interposed between the collar and ring, and the cap V for holding the ring S in place, substantially as described.

13. In a rotary Hue-cutter, the combination of the tool-stock G, the collarT screwed thereon, the nut U for locking said collar in place, the balls d interposed between the collar and ring, and the cap V secured to the collar T and inclosing said collar and the ring S and confining the latter in place While permitting it to project forward through the cap, substantially as described.

JOHN MACKENZIE.

Witnesses:

JOHN T. CARROLL,' GEORGE W. McKnu. 

